Cotton-gin rib



(Mariel) S. Z. HALL.

Cotton Gin Rib.

Pat nt ed March 22,1881.

'mlvE OR WITNESSES ATTO R N EY ":PEIEIB, PNUTD-ILITUIDQRIFHER. WASHINGLON. D. Q

UNITED STATES PATENT OF ICE.

SAMUEL Z. HALL, OF LITTLE ROCK, ARKANSAS.

COTTON-GIN RIB.

SPECIFICATION forming part of Letters Patent No. 239,298, dated March 22, 1881. Appligation filed July 24,1880. (ModeL) I To all whom it may concern Be it known that I, SAMUEL Z. HALL, of Little Rock, in the county of Pulaski and State of Arkansas, have invented a new and valuable Improvement in Ootton-GinRibs; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, and to the letters and figures of reference marked thereon.

Figure l of the drawings is a representation of a side view of my improved gin, and Fig. 2 is a section thereof.

This invention has relation to improvements in cotton-gins; and it consists in the construction and novel arrangement of parts, as here inafter shown and described. I

In gins heretofore constructed one of the great obstacles encountered is that, owing to the construction of the ribs, cove, and rollbox, too much friction is produced in keeping the roll of seed-cotton in contact with the saws and a corresponding; expenditure of power uselessly caused, the roll being only held in front of the saws by its fullness and compactness. The roll therefore rubs forcibly against the ribs, and twice as much power is required to run the gin as would be required to merely strip 0 the lint from the seed were said unnecessary means of which it is attached to the gin-frame by means of suitable screws extending through suitable perforations in the tang and extension and driven into the said frame. The tang a forms/with the body of the rib, a shoulder, c, and with the first curve, 61, of the rib an angle, d. This curve dis described from the point d, which is about one and three-quarter inch from the cove or arched roof of the roll-box B, with a radius of four and onequarterinches, this curve being flat, comparatively, and terminating at a point about two and onesixteenth inches from the point 6 aforesaid, lettered e in the drawings. At this point commences a sharper curve, f, described with a radius of one inch, and terminating at the point t, where the saw intersects the ribsay about three-quarters of an inch from the point e aforesaid.

From this point i to the point d the ribs are in that portion of the gin denominated as the roll-box, and the mass of seedcotton is rolled around in said box by the action of the saws thereon, and new surfaces subjected to the action of the saws. When the roll enters the curved portion f of the .ribs it is compressed thereby, and is held forcibly against the saws, which strip off the lint, at the point t, from the seed; but when the said roll enters the curved space 61 of the ribs it has more room and consequently expands and becomes less compact. Thus it exercises little or no friction on the portion (1 of the ribs,

ai'ipreciable friction occurring only in the curve f thereof, where it is requisite to hold the roll against the saws. The roll thus turns rapidly, and the ginning is done quickly and thoroughly.

The portions dfof the rib, instead of being curved, as described, may be made angular,

the angle at the part 01 being much more obtuse than that at the part f, with an approximately good result; but I prefer to use the curved surfaces above set forth.

I do not wish to be understood as confining myself to the precise dimensions and measurements above set forth, the gist of my invention being in the curved surfaces df formed in the face of the rib described, the former with a longer radius than the latter.

What I claim as new, and desire to secure by Letters Patent, is-

The cotton-gin rib constructed with the two concave curves elf, the latter being below the former, and commencing where the saw intersects the upper part of the rib, and having a 

